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M A I N T E N A N C E
OPERATIONS
3—7
Fig. 3
new carbon deposits. From the piston head, remove only
scaly deposits; a uniformly tenuous layer of oil carbon
need not be removed. Before refitting the cylinder cover,
thoroughly remove all carbon remains from inner side of
cylinder (cloth used should not be ravelling), rub with
motor o i l . Then make sure by turning the engine over
a few times that engine runs easily. Clean faying sur-
faces on cylinder o n d cylinder cover by wiping
them
and re-fit without gasket. Tighten the four cylinder head
nuts crosswise.
Exhaust port
In order to clean the exhaust port, take off the exhaust.
Engage highest speed and turn engine over by means
of
the
rear
wheel
(spark-plug
unscrewed)
till
piston
reaches lowest point. In automatic models possible only
by means of starting device. Coutiously remove oil car-
bon from exhaust p o r t ; take care not to damage piston
or cylinder w o r k i n g surfaces. W h e n cleaning the exhaust
port it w i l l be practical also to clean the exhaust muffler
(see f o l l o w i n g chapter).
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